From The Gospel-Centered Life, by Bob Thune and Will Walker:
If the gospel is renewing you internally, it will also be propelling you externally. It must do so, for it is the good news of the Kingdom (Matt. 9:35), and the Kingdom of God is not personal and private! Jesus taught us to pray, "Your Kingdom come, Your will be done, on earth as it is in heaven" (Matt. 6:10). When we pray for the coming of God's Kingdom, we are praying both that Jesus would reign in the hearts of people (inward) and that His will would be done everywhere just as it is in heaven (external).